本文介绍了Django多态模型在1.7上进行迁移时遇到问题的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我在模型中使用Django 1.7和django-polymorphic
I am using Django 1.7 and django-polymorphic for my models
class ReferenceItem(PolymorphicModel):
created_at = models.DateTimeField(_('date created'), auto_now_add=True, db_index=True)
updated_at = models.DateTimeField(_('date modified'), auto_now=True, db_index=True)
uuid = UUIDField(auto=True, unique=True)
description = models.CharField(max_length=255)
class OrderItem(ReferenceItem):
order = models.ForeignKey('Order', related_name='items')
sku = models.CharField(max_length=255)
quantity = models.IntegerField()
unit_price = models.DecimalField(max_digits=10, decimal_places=2)
amount = models.DecimalField(max_digits=10, decimal_places=2)
tax_rate = models.DecimalField(max_digits=3, decimal_places=2)
commission_rate = models.DecimalField(max_digits=3, decimal_places=2)
当我运行makemigrations
时,出现此错误:
When I ran makemigrations
I got this error:
raise InvalidBasesError("Cannot resolve bases for %r\nThis can happen if you are inheriting models from an app with migrations (e.g. contrib.auth)\n in an app with no migrations; see https://docs.djangoproject.com/en/1.7/topics/migrations/#dependencies for more" % new_unrendered_models)
django.db.migrations.state.InvalidBasesError: Cannot resolve bases for [<ModelState: 'orders.OrderItem'>]
This can happen if you are inheriting models from an app with migrations (e.g. contrib.auth)
我已经查看过django 票,但仍然不知道问题出在哪里.
I have been through the django ticket but still unaware what the problem is.
推荐答案
我猜这与多态包无关.
我要解决的问题是注释掉我的应用程序,保留内置的Django应用程序,运行./manage.py migrate
迁移系统应用程序,然后取消注释我的应用程序,然后运行./manage.py makemigrations
What I have done to fix it is to comment out my apps, leaving the builtin django apps, run ./manage.py migrate
to migrate the system apps, then uncomment my apps, and run ./manage.py makemigrations
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